use rand::Rng;
use std::cmp::Ordering;
use std::io;

fn main() {
    println!("Hello, world!");

    let secret_number = rand::thread_rng().gen_range(1..=100);
    println!("The secret number is: {secret_number}");

    loop {
        println!("please input a number");

        let mut guess = String::new();
        io::stdin().read_line(&mut guess).expect("input guess fail");
        println!("you guess {guess}");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("invalid input");
                continue;
            }
        };

        println!("You guessed: {guess}");

        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("You win!");
                break;
            }
        }
    }
}
